The nature of Polyvinyl Alcohol:
Polyvinyl Alcohol, referred to as PVA, the chemical formula of it is 一[CH CH(OH)] 一, white sheet, flocculent or powdery solid, odorless, non-toxic, non-polluting, can be dissolved in water at 80 ~ 90 ℃, is a solution polymerization of vinyl acetate by the alcohol made from water-soluble polymers, can be divided into fiber and non-fiber two types. Its aqueous solution has good bonding properties and film-forming properties, most organic solvents resistant to oils, lubricants and hydrocarbons, etc., having a long chain polyol esterification, etherification, acetalization and other chemical properties.
The market situation of Polyvinyl Alcohol:
PVA is the only water-soluble polymers have found so far, since the 1920s has been found that in 40 years to achieve a large-scale industrial production, initially mainly for medical surgical thread and Polyvinyl Alcohol Fiber spinning materials. Subsequently some unique performance PVA gradually discovered ability mineral oils, greases, lubricants and most organic solvents, acoustic, acoustic accurate, but also has better bonding strength resistance, film flexibility, smoothness, oil resistance, solvent resistance, protective colloid, gas block, and abrasion resistance as well as specially treated with water resistance. Downstream products used in the textile, food, medicine, construction, wood processing, paper, printing, agriculture, metallurgy and other industries.
After the researchers modified polyvinyl alcohol or adding other polymer materials out of the medical equipment, food packaging, office supplies and sanitary materials, etc., can be biodegradable polyvinyl alcohol has opened up a wider range of applications.
China has become the world 's largest PVA production capacity and yield, the basic balance is also the country 's largest consumer, producing approximately 520,000 t / a, demand, accounting for about 50 % of the world 's total. But the production of varieties is relatively simple, mostly ordinary viscosity and degree of hydrolysis of conventional products, mainly used in construction adhesives, textile and pulp and other low areas. Currently particularly high or especially low degree of polymerization , low-alcohol solution of the fine and special varieties of high production technology no major breakthrough , the manufacturers of such products on the market mainly in Japan , the United States.
Polyvinyl Alcohol, referred to as PVA, the chemical formula of it is 一[CH CH(OH)] 一, white sheet, flocculent or powdery solid, odorless, non-toxic, non-polluting, can be dissolved in water at 80 ~ 90 ℃, is a solution polymerization of vinyl acetate by the alcohol made from water-soluble polymers, can be divided into fiber and non-fiber two types. Its aqueous solution has good bonding properties and film-forming properties, most organic solvents resistant to oils, lubricants and hydrocarbons, etc., having a long chain polyol esterification, etherification, acetalization and other chemical properties.
The market situation of Polyvinyl Alcohol:
PVA is the only water-soluble polymers have found so far, since the 1920s has been found that in 40 years to achieve a large-scale industrial production, initially mainly for medical surgical thread and Polyvinyl Alcohol Fiber spinning materials. Subsequently some unique performance PVA gradually discovered ability mineral oils, greases, lubricants and most organic solvents, acoustic, acoustic accurate, but also has better bonding strength resistance, film flexibility, smoothness, oil resistance, solvent resistance, protective colloid, gas block, and abrasion resistance as well as specially treated with water resistance. Downstream products used in the textile, food, medicine, construction, wood processing, paper, printing, agriculture, metallurgy and other industries.
After the researchers modified polyvinyl alcohol or adding other polymer materials out of the medical equipment, food packaging, office supplies and sanitary materials, etc., can be biodegradable polyvinyl alcohol has opened up a wider range of applications.
China has become the world 's largest PVA production capacity and yield, the basic balance is also the country 's largest consumer, producing approximately 520,000 t / a, demand, accounting for about 50 % of the world 's total. But the production of varieties is relatively simple, mostly ordinary viscosity and degree of hydrolysis of conventional products, mainly used in construction adhesives, textile and pulp and other low areas. Currently particularly high or especially low degree of polymerization , low-alcohol solution of the fine and special varieties of high production technology no major breakthrough , the manufacturers of such products on the market mainly in Japan , the United States.